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Most abundant eubacterial phyla found in the three groups. The figure represents the log abundance of (A) the most abundant bacterial phyla found in the oral mucosa, for the groups of controls, only smokers and smokers/drinkers; (B) Neisseria with a significant decrease in smokers/drinkers and only smokers when compared to controls. Columns represent the average log abundance ± standard error (S.E) and (*) indicates p < 0.05.
